Backport of Calculate namespace prefix before tainting route entries into release/1.13.x #21484
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Backport
This PR is auto-generated from #21470 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
This is essentially the 'fix' code we used as part of resolving a recent sev 1, where we pre-calculate the namespace path, as we do in the other place we call
c.router.Taint(ctx, path)
. The PR for that change is here: #15067 . I added debug logging including the places where we disagree, and added it to the other place we pre-calculate namespace prefixes.There may be more adjustments/improvements we want to make to add additional safety to tainting, such as preventing the root "sys/" from ever being tainted, but if we did want to add those, we can do as part of a different PR. I wanted to keep this PR with a small scope, specifically targeting the fix.
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